Turbulence: What is it and is it getting worse?

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There's been a number of incidents around the world so far this year that have left dozens of flyers needing hospital treatment because of complications caused by turbulence. In the latest, one person died and 30 people were injured on a Singapore Airlines flight which took off from London. So what causes turbulence and are incidents rising? With the answers in our latest episode of our 5 Questions On podcast is the BBC's weather forecaster and ex RAF officer, Simon King. Image Credit: Reuters